diff --git a/readme.md b/readme.md
index d07e26c..3e25bfa 100644
--- a/readme.md
+++ b/readme.md
@@ -126,6 +126,7 @@ Below are the external dependencies for testbed. If you don't care about testbed
 
 * Cloth
 * Vertex contact, friction
+* Strech, shear, spring force types
 * Linear time solver
 * Unconditional simulation stability
 * Ray-casting